Toshiba 3LCD Projector - No image from the...

Question

I am unable to project images from laptop via my projector. The green lights come on when the projector is switched and the Toshiba logo is projected on to a screen. However, the computer does not seem to be recognised by the projector or vice versa. The projector light is on but does not seem powerful enough. What is wrong ? Do I need to do something?